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excess of detection limits In soil and groundwater In the vicinity of the former tank <br /> location This assessment included the installation of three groundwater monitoring <br /> wells, MW-1, MW-2, and MW-3, and four soil borings, B-1, B-2, B-3, and B-4 <br /> In September 1989, the District removed the two remaining USTs No <br /> indications of leakage from these tanks were observed and no petroleum <br /> hydrocarbons in excess of detection limits were found In the soil beneath the tanks <br /> These two USTs were replaced with two above ground tanks <br /> In February 1991, Roy F Weston, Inc (Weston) conducted an additional <br /> assessment of the site that included drilling four soil borings and completing each as <br /> ' monitoring wells (MW-4, MW-5, MW-b, and MW-7) Toluene and lead were <br /> detected in soil samples from all four borings while xylenes were detected in soil <br /> ' samples from three of the four borings Benzene, xylenes, and total petroleum <br /> hydrocarbons in the gasoline range (TPH-g) were detected in groundwater samples <br /> ' from MW-1 Petroleum hydrocarbons in excess of detection limits were not identified <br /> in the groundwater from any other monitoring well <br /> Weston conducted quarterly monitoring of the groundwater monitoring wells <br /> ' for the second and third quarters of 1992 and the first and second quarters of 1993 <br /> Benzene, toluene, xylenes, and TPH-g were detected only in MW-1 during these <br /> sampling events <br /> In August and September 1993, BVWST conducted an additional assessment <br /> of the site that included the collection of groundwater samples from seven <br /> HydroPunch II® locations (HP-1, HP-2, HP-3, HP-4, HP-5, HP-b, and HP-7) and the <br /> installation of two groundwater monitoring wells (MW-8 and MW-9) Petroleum <br /> ' hydrocarbons were detected in groundwater from HP-1, HP-4, HP-5, and MW-8 <br /> Petroleum hydrocarbons were not detected in groundwater samples collected from <br /> ' HP-2, HP-3, HP-7, or MW-9 Sol] samples were collected during the installation of <br /> MW-8 and MW-9 Soil samples from MW-8 contained levels of TPH-g in excess of <br /> ' detection limits The assessment activities and analytical results from the soil and <br /> groundwater sampling are presented In the Draft Third Quarter 1993 Groundwater <br /> Monitonng Report, submitted to the SJCPHS Environmental Health Division in <br /> ' October 1993, and the Draft Additional Site Assessment and Remedial Options Report, <br /> submitted to the SJCPHS Environmental Health Division in January 1994 <br /> BVWST conducted Fourth Quarter 1993 groundwater monitoring in December <br /> 1993 The monitoring activities and analytical results for this quarter are presented <br /> ' in the Quarterly Monitonng Program, Fourth Quarter 1993, submitted to the SJCPHS <br /> Environmental Health Division on January 14, 1994 The Fourth Quarter 1993 <br /> ' 94RB East Bay Municipal Utility District <br /> 4041296001stgtrgw 2 Stockton Service Center First Quarter 1994 <br />